单项选择题
A.20:9 B.12:9 C.1:72 D.1:160
A.1.93倍 B.1.53倍 C.1.03倍 D.0.97倍
A.13.36%,21.78% B.37.81%,34.59% C.37.81%,21.78% D.13.36%.34.59%